package com.ruoyi.web.controller.common;

import java.util.*;
import java.util.stream.Collectors;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

/**
 * 通用请求处理
 */

@RestController
@RequestMapping("/common")
public class CommonController
{
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    // 注入 Spring MVC 映射处理器
    @Autowired
    private RequestMappingHandlerMapping handlerMapping;

    private static final String FILE_DELIMETER = ",";


//    @PostConstruct
    public void printMappings() {
        log.info("===== 已加载的 URL 映射信息 =====");

        // 获取所有映射信息（RequestMappingInfo -> HandlerMethod）
        Map<RequestMappingInfo, HandlerMethod> mappings = handlerMapping.getHandlerMethods();

        Iterator<Map.Entry<RequestMappingInfo, HandlerMethod>> iterator = mappings.entrySet().iterator();
        while (iterator.hasNext()) {
            try {
                Map.Entry<RequestMappingInfo, HandlerMethod> entry = iterator.next();
                RequestMappingInfo info = entry.getKey();
                HandlerMethod method = entry.getValue();
                if (info == null || method == null) {
                    iterator.remove(); // 移除空记录（可选，需确保 Map 支持修改）
                    continue;
                }
                // 提取映射信息（同方案1的 extractMappingInfo 方法）
                extractMappingInfo(info, method);

            } catch (Exception e) {
                System.err.println("处理映射记录时发生异常，跳过该记录");
            }
        }
    }

    private void extractMappingInfo(RequestMappingInfo info, HandlerMethod method) {
        // 安全获取 URL 路径（兼容 Spring 4.x+）
        Set<String> urlPatterns = info.getPathPatternsCondition() != null
                ? info.getPathPatternsCondition().getPatternValues()
                : Set.of();

        // 安全获取 HTTP 请求方法（如 GET/POST）
        // 转为字符串（如 "GET"）
        Set<String> httpMethods = info.getMethodsCondition().getMethods().stream()
        .map(Enum::name) // 转为字符串（如 "GET"）
        .collect(Collectors.toSet()); // 无指定方法时默认“任意方法”

        // 安全获取处理方法信息（避免 ClassNotFoundException）
        String controllerName = method.getBeanType().getSimpleName();
        String methodName = method.getMethod().getName();
        String fullMethodName = controllerName + "." + methodName + "()";

        log.info("路径: {},方法: {},处理: {}", urlPatterns,httpMethods,fullMethodName);

    }

    @GetMapping("/file")
    public AjaxResult viewFile(@RequestParam String path){
        String localPath = RuoYiConfig.getProfile();
        String url = serverConfig.getUrl() + localPath + path;
        return AjaxResult.success(url);
    }

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + FileUtils.stripPrefix(resource);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }
}
